You will need DotImage 4.0 for GlyphReader OCR.  As of version 2.1 of DotImage, all subsequent versions of the SDK are completely independant and can be installed side by side.  You can install DotImage 4.0 and DotImage 3.0 at the same time.  In order to upgrade your application from 3.0 to 4.0, you'll need to change the references in your application.

If you do not have an active gold support contract, you can request an evaluation license of DotImage 4.0.  To be sure it hasn't already expired, please contact sales or support and request an evaluation extension.